NET
16 We have come to know love by this: that Jesus laid down his life for us; thus we ought to lay down our lives for our fellow Christians.
Darby
16 Hereby we have known love, because *he* has laid down his life for us; and *we* ought for the brethren to lay down [our] lives.
KJV
16 Hereby perceive we the love [of God], because he laid down his life for us: and we ought to lay down [our] lives for the brethren.